[talk-ch] Reliefs layers for openstreetmap.ch

Stefan Keller sfkeller at gmail.com
Wed Jan 2 02:44:50 CET 2013


Dear Yves

Thanks for the explanations.
Do you know the differences from the SRTM v3 you mentiones to this new
version 4.1?
http://www.cgiar-csi.org/data/srtm-90m-digital-elevation-database-v4-1

Yours, Stefan


2013/1/1 Etienne Trimaille <etienne at trimaille.eu>:
> Merci pour les explications Yves.
>
> Si jamais tes sources avec un howto sont disponibles, je suis preneur ;-)
> Je suis en train de me pencher sur mapnik en ce moment, je vais en avoir
> besoin avec du relief.
>
>
> 2012/12/29 yvecai <yvecai at gmail.com>
>>
>> I downloaded SRTM v3 via the usual ftp, then, patiently, ASTER from
>> http://reverb.echo.nasa.gov/reverb/ (that's doable).
>> SRTM void are filled from Aster data with a homemade python script, then
>> the filled void are smoothen with a 3x3 average filter.
>> 1x1° tiles of hillshade, slopes are computed with gdaldem, then composed
>> with imagemagick.
>> A bif tiff in latlon is merged with gdal, then reprojected to 3857.
>> Finally, a modified version of gdal2tile computred tiles from zoom 11 and
>> store them in an sqlite.
>> I'll took the time to put the scripts on github one day.
>>
>> Note: Sadly, the Matterhorn is wrong in Aster.
>>
>> Yves
>>
>>
>> On 12/29/2012 01:22 PM, Stefan Keller wrote:
>>>
>>> Salut Yves
>>>
>>> Nice job!
>>> I hope the maintainer of www.openstreetmap.ch will read this post.
>>> Just to be curious: How did you process the hillshades and from which
>>> URL did you download the original data?
>>>
>>> Yours, Stefan
>>>
>>>
>>> 2012/12/29 yvecai <yvecai at gmail.com>:
>>>>
>>>> I hereby offer www.openstreetmap.ch to use on its web map the contour
>>>> lines
>>>> (isohypses) and hillshading overlay layers available at
>>>> www.pistes-nordiques.org.
>>>> The attribution must quote the following: "ASTER GDEM is a product of
>>>> METI
>>>> and NASA".
>>>>
>>>> Yves, webmaster pistes-nordiques.org
>>>> _______________________________________________
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>>>> talk-ch at openstreetmap.ch
>>>> http://lists.openstreetmap.ch/mailman/listinfo/talk-ch
>>>
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>>
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>
>
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